C# 循环语句里如何实现暂停一段时间再继续执行，不能用Thread.Sleep(1000);

"可用timer控件，进行计时等待追问：能不能给下详细的代码 下面是我的代码 但是不对
private System.Timers.Timer timerClock;
private void button8_Click(object sender, System.EventArgs e)
{
while(day<27)
{
timerClock = new System.Timers.Timer();
timerClock.Elapsed += new ElapsedEventHandler(OnTimer);
timerClock.Interval = 3000;
timerClock.Enabled = true;
day++;
}
}
public void OnTimer(Object source, ElapsedEventArgs e)
{
}"